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Signed-off-by: AC <ac@fabtek.cn>
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<root xml:lang="en"/>,root.SelectAttr("xml:lang").NamespaceURI()returns an empty string unless the document explicitly declaresxmlns:xml. XML-prefixed elements have the same problem.Namespaces in XML §3 defines the
xmlprefix as always bound tohttp://www.w3.org/XML/1998/namespace; a declaration is optional. Recognize that binding in the shared namespace lookup. Ordinary declared/default namespaces retain their existing handling.The regression covers implicit and explicit declarations, a surrounding default namespace,
xml:lang/xml:space, and a copied XML-prefixed element detached from its original declaration. All three subtests fail on the base revision and pass after this change.go test ./...,go test -race ./...,go vet ./...,go build ./..., andgit diff --checkpass on Go 1.27.1 / Linux arm64. Go 1.23 and other platforms were not run locally.AI assistance: OpenAI Codex investigated, implemented, and ran these checks.